.header {
  margin: 0 auto;
  height: 100vh;
}
.header__navigation {
  padding: 40px 0 40px;
}
@media screen and (max-width: 780px) {
  .header__navigation {
    display: none;
  }
}
.header__navigation-list {
  margin: 0 auto;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 65px;
}
@media screen and (max-width: 1080px) {
  .header__navigation-list {
    gap: 40px;
  }
}
.header__navigation-item {
  font-size: 18px;
  color: white;
}
@media screen and (max-width: 1080px) {
  .header__navigation-item {
    font-size: 15px;
  }
}

.main-navigation:hover {
  background-color: white;
  width: 110px;
  height: 110px;
  backdrop-filter: blur(100px);
  border-radius: 50%;
}

.header__navigation-item:hover {
  background-image: linear-gradient(to right, #D81696 0%, #4995BC 100%);
  /* обрезаем фон по тексту */
  -webkit-background-clip: text;
  /* меняет цвет текста заголовка на прозрачный что бы можно было увидеть градиент*/
  -webkit-text-fill-color: transparent;
}
.header__title {
  /* margin: 0 auto; */
  padding: 70px 0;
  font-size: 50px;
  background-image: linear-gradient(#D81696, #77359A, #4995BC);
  text-align: center;
}
@media screen and (max-width: 780px) {
  .header__title {
    font-size: 42px;
    padding: 80px 50px;
  }
}
@media screen and (max-width: 480px) {
  .header__title {
    font-size: 30px;
    padding: 60px 40px;
  }
}
.cipus-img {
  display: block; 
  margin: 40px auto; 
  width: 500px; 
  height: 250px; 
}
@media screen and (max-width: 780px) {
.cipus-img {
    width: 300px; 
    height: 150px; 
  }
}
.header__description {
  max-width: 688px;
  margin: 0 auto;
  padding: 50px 0;
  font-size: 30px;
  text-align: center;
}
@media screen and (max-width: 780px) {
  .header__description {
    font-size: 26px;
    padding: 40px 50px;
  }
}
@media screen and (max-width: 480px) {
  .header__description {
    font-size: 18px;
    padding: 20px 10px;
  }
}
  /* Бургер-меню - мобильная версия */
  .burger-btn {
      display: none;
      position: fixed;
      top: 30px;
      right: 30px;
      width: 40px;
      height: 30px;
      flex-direction: column;
      justify-content: space-between;
      cursor: pointer;
      z-index: 1001;
      background: transparent;
      border: none;
  }
  
  .burger-line {
      width: 100%;
      height: 4px;
      background: white;
      transition: all 0.3s;
  }
  
  .mobile-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: rgba(0, 0, 0, 0.2);
    -webkit-backdrop-filter: blur(10px);
      backdrop-filter: blur(10px);
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      z-index: 1000;
      opacity: 0;
      visibility: hidden;
      transition: all 0.3s;
  }
  
  .mobile-nav.active {
      opacity: 1;
      visibility: visible;
  }
  
  .mobile-nav-list {
      list-style: none;
      text-align: center;
  }
  
  .mobile-nav-item {
      margin: 25px 0;
      transform: translateY(20px);
      opacity: 0;
      transition: all 0.3s;
  }
  
  .mobile-nav.active .mobile-nav-item {
      transform: translateY(0);
      opacity: 1;
  }
  
  .mobile-nav-item a {
      color: white;
      text-decoration: none;
      font-size: 24px;
      transition: color 0.3s;
      padding: 10px 20px;
      display: inline-block;
  }
  
  .mobile-nav-item a:hover {
      color: #D81696;
  }
  
  /* Анимация бургера */
  .burger-btn.active .burger-line:nth-child(1) {
      transform: translateY(13px) rotate(45deg);
  }
  
  .burger-btn.active .burger-line:nth-child(2) {
      opacity: 0;
  }
  
  .burger-btn.active .burger-line:nth-child(3) {
      transform: translateY(-13px) rotate(-45deg);
  }
  
  /* Медиазапросы */
  @media (max-width: 780px) {
      /* .header__navigation {
          display: none;
      } */
      
      .burger-btn {
          display: flex;
      }
      
      /* Задержка для анимации пунктов меню */
      .mobile-nav-item:nth-child(1) { transition-delay: 0.1s; }
      .mobile-nav-item:nth-child(2) { transition-delay: 0.2s; }
      .mobile-nav-item:nth-child(3) { transition-delay: 0.3s; }
      .mobile-nav-item:nth-child(4) { transition-delay: 0.4s; }
      .mobile-nav-item:nth-child(5) { transition-delay: 0.5s; }
      
  }
  
  @media (max-width: 480px) {
    .burger-btn {
        top: 20px;
        right: 20px;
        width: 35px;
        height: 25px;
    }

    .mobile-nav-item a {
        font-size: 20px;
    }
  }

.main:before {
  background: url(../img/logo-300.svg);
  background-repeat: no-repeat;
  background-position: center;
  background-size: 60%;
  content: '';
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  position: fixed;
  z-index: -1;
}


@media screen and (max-width: 1400px) {
  .main:before {
    background-size: 75%;
  }
}
@media screen and (max-width: 1080px) {
  .main:before {
    background-size: 90%;
  }
}
@media screen and (max-width: 780px) {
  .main:before {
    background-size: 110%;
  }
}
@media screen and (max-width: 480px) {
  .main:before {
    background-size: 110%;
  }
}


/* POSSIBILITY */
.section__possibility {
  margin: 0 auto;
  padding-top: 50px;
  padding-bottom: 100px;
}
@media screen and (max-width: 480px) {
  .section__possibility {
    padding-bottom: 50px;
  }
}
.section__possibility-title {
  margin: 0 auto 70px;
  font-size: 20px;
  color: #D81696;
  text-align: center;
}
.section__possibility-description {
  margin: 0 auto 130px;
  width: 1000px;
  padding: 20px 147px;
  background-image: linear-gradient(90deg, #D81696, #77359A);
  font-size: 18px;
  font-weight: 400;
  text-align: center;
  border-radius: 300px;
}
@media screen and (max-width: 1080px) {
  .section__possibility-description {
    width: 700px;
    padding: 20px 30px;  
  }
}
@media screen and (max-width: 780px) {
  .section__possibility-description {
    width: 400px;
    border-radius: 50px;
    font-size: 14px;
  }
}
@media screen and (max-width: 480px) {
  .section__possibility-description {
    width: 280px;
    border-radius: 40px;
    font-size: 12px;
  }
}
.possibility__project-description_title {
  margin: 0 auto 100px;
  font-size: 30px;
  font-weight: 600;
  text-align: center;

}
.possibility__project-description__wrapper {
  margin: 0 auto;
  padding: 0 10px;
}
.project-description__list {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  gap: 30px;
  height: auto;
}
.project-description__items {
  height: auto;
  padding-bottom: 10px;
}
.project-description__item-title {
  font-size: 20px;
  text-align: center;
  margin-bottom: 20px;
}
.project-description__list-info {
  padding: 30px 10px 30px 30px;
  border-radius: 30px;
}
.project-description__item-info {
  list-style-type: disc;
  font-size: 14px;
  padding-bottom: 10px;
}


/* ВНЕДРЕНИЕ */
.section__implementation {
  margin: 0 auto;
  padding: 50px 0;
}
.section__implementation-title {
  text-align: center;
  font-size: 30px;
  font-weight: bold;
  color: #D81696;
  padding-top: 50px;
  padding-bottom: 50px;
  background-color: black;
}
.implementation__wrapper {
  margin-bottom: 100px;
  padding-bottom: 50px;
  background-color: black;
}
.implementation__list {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 120px;
  flex-wrap: wrap;
}
@media screen and (max-width: 480px) {
.implementation__list {
  gap: 30px;
  }
}
.implementation__items {
  width: 190px;
}
@media screen and (max-width: 480px) {
.implementation__items {
  margin: 0 auto;
  text-align: center;
  }
}
.implementation__number {
  font-size: 130px;
  color: #D81696;
}
.implementation__effect {
  font-size: 16px;
  color: white;
  font-weight: 400;
  line-height: 130%;
}

.implementation__advantages__wrapper {
  margin: 0 auto;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 30px;
  max-width: 1200px;
  padding: 0 10px;
}
.implementation__advantages {
  width: 380px;
  padding: 30px 10px 10px;
  border: 1px solid white;
}
.implementation__advantages-title {
  font-size: 20px;
  text-align: center;
  padding-bottom: 20px;
  font-weight: 600;
}
.implementation__advantages-list {
  padding-left: 30px;
}
.implementation__advantages-items {
  font-size: 14px;
  list-style-type: disc;
  padding-bottom: 10px;
  font-weight: 400;
}
.implementation__advantages-effects {
  text-align: center;
  color: #000;
  padding-bottom: 20px;
  font-weight: 600;
font-size: 20px;
}

/* УЗНАТЬ СТОИМОСТЬ */
.section__price {
  margin: 0 auto;
  background-color: #000;
  padding-bottom: 60px;
}
.section__price-title {
  margin: 0 auto 50px;
  font-size: 70px;
  background-image: linear-gradient(to right, #ff7af4 0%, #5de7ff 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  text-align: center;
  font-weight: 700;
}
@media screen and (max-width: 780px) {
  .section__price-title {
    font-size: 50px;
  }
}
@media screen and (max-width: 480px) {
  .section__price-title {
    font-size: 40px;
  }
}
.price__form {
  margin: 0 auto;
}
.requiredField {
  display: block;
  margin: 0 auto 50px;
  width: 600px;
  border-bottom: 2px solid white;
  text-align: center;
  color: white;
}
@media screen and (max-width: 780px) {
  .requiredField {
    font-size: 20px;
    width: 300px;
  }
}
@media screen and (max-width: 480px) {
  .requiredField {
    font-size: 14px;
    width: 200px;
  }
}

.price__form-btn {
  display: block;
  margin: 20px auto;
  padding: 25px 95px;
  font-size: 18px;
  font-weight: 500;
  background-color: #D81696;
  border-radius: 50px;
  text-align: center;
}
@media screen and (max-width: 780px) {
  .price__form-btn {
    padding: 20px 60px;
  }
}
@media screen and (max-width: 480px) {
  .price__form-btn {
    padding: 10px 10px;
    font-size: 14px;
  }
}
/* КОНТАКТЫ */
.section__contacts {
  margin: 0 auto 30px;
  font-weight: 500;
  background-color: black;
}
.contacts__title {
  font-weight: 400;
  margin-bottom: 50px;
}
.contacts__navigation {
  margin: 0 auto 20px;
}
.contacts__navigation-list {
  margin: 0 auto 40px;
  gap: 200px;
}
@media screen and (max-width: 1080px) {
  .contacts__navigation-list {
    gap: 100px;
  }
}
@media screen and (max-width: 780px) {
  .contacts__navigation-list {
    gap: 15px;
    padding: 0 50px;
  }
}


/* КОНТАКТЫ */
.flex-footer {
  display: flex;
  align-items: center;
  justify-content: center;
}
@media screen and (max-width: 780px) {
  .flex-footer {
    flex-wrap: wrap;
  }
}
.contacts__navigation-items {
  text-align: center;
  width: 200px;
  height: 50px;
  font-size: 16px;
  background-image: linear-gradient(90deg, #D81696, #77359A);
  color: #FFF;
  border-radius: 500px;
  display: flex;
  justify-content: center;
  align-items: center;
}

.contacts__navigation-items a {
  text-decoration: none !important;
  -webkit-text-decoration: none !important;
}

@media screen and (max-width: 1080px) {
  .contacts__navigation-items {
    font-size: 14px;
  }
}
.footer__item-num {
  background-image: linear-gradient(90deg, #D81696, #77359A);
}
.footer__item-mail {
  background-image: linear-gradient(90deg, #20E7D9, #D81696);
}
.footer__item-message {
  background-image: linear-gradient(90deg, #77359A, #20E7D9);
}
.contacts__navigation-list__llc {
  margin: 0 auto;
}
.navigation-list__llc-name {
  background-image: linear-gradient(90deg, #D81696, #20E7D9);
  color: #FFF;
  width: 770px;
  height: 50px;
  font-size: 16px;
  margin: 0 auto 20px;
  text-align: center;
  border-radius: 100px;
  display: flex;
  justify-content: center;
  align-items: center;
}

.navigation-list__llc-name p {
  text-decoration: none !important;
  -webkit-text-decoration: none !important;
}

@media screen and (max-width: 1080px) {
  .navigation-list__llc-name {
    width: 500px;
    font-size: 14px;
  }
}
@media screen and (max-width: 780px) {
  .navigation-list__llc-name {
    width: 400px;
    font-size: 14px;
    height: 40px;
  }
}
@media screen and (max-width: 480px) {
  .navigation-list__llc-name {
    width: 280px;
    font-size: 14px;
  }
}
.navigation-list__llc-address {
  background-image: linear-gradient(90deg, #20E7D9, #D81696);
  color: #FFF;
  font-size: 16px;
  width: 770px;
  height: 50px;
  margin: 0 auto;
  text-align: center;
  border-radius: 200px;
  display: flex;
  justify-content: center;
  align-items: center;
}

.navigation-list__llc-address p {
  text-decoration: none !important;
  -webkit-text-decoration: none !important;
}

@media screen and (max-width: 1080px) {
  .navigation-list__llc-address {
    width: 500px;
    font-size: 14px;
  }
}
@media screen and (max-width: 780px) {
  .navigation-list__llc-address {
    width: 400px;
    font-size: 17px;
  }
}
@media screen and (max-width: 480px) {
  .navigation-list__llc-address {
    width: 280px;
    font-size: 14px;
  }
}
.contacts__inn {
  color: #FFF;
  font-size: 16px;
  text-align: center;
}
@media screen and (max-width: 1080px) {
  .contacts__inn {
    font-size: 14px;
  }
}

.contacts__kpp {
  color: #FFF;
  font-size: 16px;
  text-align: center;
  margin-bottom: 30px;
}
@media screen and (max-width: 1080px) {
  .contacts__kpp {
    font-size: 14px;
  }
}
.contacts__rights {
  font-size: 12px;
  text-align: center;
}
@media screen and (max-width: 1080px) {
  .contacts__rights {
    font-size: 10px;
  }
}
#backToTopBtn {
  display: none; /* Скрываем кнопку по умолчанию */
  position: fixed;
  bottom: 50px;
  right: 50px;
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background-color: #000000;
  cursor: pointer;
  z-index: 99;
  transition: opacity 0.3s, background-color 0.3s;
}
#backToTopBtn:hover {
  background-color: #ffffff;
}

@media screen and (max-width: 1080px) {
  #backToTopBtn {
    width: 100px;
    height: 100px;
  }
}
@media screen and (max-width: 780px) {
  #backToTopBtn {
    width: 80px;
    height: 80px;
  }
}
@media screen and (max-width: 480px) {
  #backToTopBtn {
    width: 50px;
    height: 50px;
  }
}